公路下伏采空区泡沫轻质土新型注浆材料施工性能试验研究

对采空区注浆处治常用的水泥粉煤灰浆液进行发泡改性，制成泡沫轻质土新型注浆材料，通过室内试验研究其施工性能及其影响因素。结果表明:在同一固相比条件下，浆液流动度随着水固比的减小而减小。新材料流动性随泡沫溶液掺量的增加而减小；随着水固比的减小和泡沫溶液掺量的增加，新材料的分离率逐渐减小；在相同固相比情况下，泡沫轻质土凝结时间随着水固比（水灰比）的减小而相应地缩短。水固比（水灰比）对泡沫轻质土的凝结时间有显著影响；提出了满足施工要求的公路下伏采空区泡沫轻质土新型注浆材料的配比范围。

Experimental Study on Workability of New Grouting Material for Foam Light Soil of Goaf under Highway Engineering

The workability and its impact factors are determined for a new grouting material for foam light soil made by foaming modification of cement and flying ash grout commonly used for grouting in the goaf by internal experimental study. The study result shows that, under the condition of the same solid phase ratio, the fluidity of grout decreases with the decrease of water solid ratio; the liquidity of new material decreases with the increase of foam solution content; as the water solid ratio decreases and the foam solution content increases, the new material’s separation rate reduces gradually; under the condition of the same solid phase ratio, the setting time of foamed light soil is shortened with the decrease of water solid ratio (water cement ratio); the water solid ratio (water cement ratio) has significant effect on the setting time of foam light soil. Finally, the range of the mixing ratio was proposed for of the new grouting material meeting the application property.